ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYAL..............................JDIM350 (Ver 2.1 Jan 2001) 1620000/0 1990980/00883326EUROPEAN PATENT APPLICATIONA320050713EP98401302.919980529EnEnEn1452809719970603JP813349819980327JP20050713200528199812091998507 7H 04R 17/00 A 7H 01F 1/00 B 7H 01F 19/02 BdeTransformator für piezoelektrischen Lautsprecher und piezoelektrischer Lautsprecher mit diesem TransformatorenTransformer for piezoelectric speaker and piezoelectric speaker operative with said transformerfrTransformateur pour haut-parleur piézoélectrique et haut-parleur piézoélectrique fonctionnant avec ce transformateur1MURATA MANUFACTURING CO., LTD.00270286J13612-127EPO/j26-10, Tenjin 2-chomeNagaokakyo-shi Kyoto-fuJPNakamura, Takeshi, c/o Murata Manufact.Co., Ltd26-10, Tenjin 2-ChomeNagaokakyo-shi, Kyoto-FuJPJoly, Jean-Jacqueset al00039741Cabinet Beau de Loménie 158, rue de l'Université75340 Paris Cédex 07FRATBECHCYDEDKESFIFRGBGRIEITLILUMCNLPTSEALLTLVMKROSI20050713200528

The transformer (10) for a piezoelectric speaker includes an E-shaped magnetic core (11). An inner secondary winding (12a) having a number of turns corresponding to approximately one-half of the number of turns of a secondary winding (12) is wound around a shaft portion of the magnetic core (11). A primary winding (13) is wound around the shaft portion of the magnetic core (11) over the inner secondary winding (12a). Further, an outer secondary winding (12b) having a number of turns corresponding to the another half of the number of turns of the secondary winding (12) is wound around the shaft portion of the magnetic core (11) over the primary winding (13). An I-shaped core (16) is provided at the open side of the E-shaped magnetic core (11).